Another great feature of Mixpo SmartVideo is their publish once feature, which allows an advertiser to set up the advertisement and overlays and then publish it to any platform. It utilizes VAST and VPAID as well as a bit of Javascript that determines the user’s browser and platform and then serves either the Flash or the HTML5 version of the ad. Now there is one piece of functionality that is a bit more work for HTML5 and that is if a publisher wants to make some sort of custom Flash widget to use. Since we all know Flash doesn’t work on ALL platforms (unless you take into account some of the most recent moves by Adobe ) it will need to be transformed into HTML5 compatible code to work properly.